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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca20c8b6e13d9fea6543cfa0f4818534bc6854937cfe36b727d9c10cafd0d6f' 
  AND token = 'bwoR0dDHbEUyBf5cNEfSSwIhjpQboIIecECkLtSOIdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}